[llvm] [SPARC][IAS] Make Is64Bit imply FeatureV9 in the assembler (PR #143232)

[via llvm-commits]

koachan wrote:

> Yes, very. Although I would say `HasV9` should imply `Is64Bit`. But this is probably not how the definitions are written and I can add a workaround for our very specific use case.

It's possible to target V9 while still using 32-bit addressing, that's why HasV9 is placed under Is64Bit and not otherwise.

> Ah btw. Doesn't the three VIS extensions also imply V9?

Not sure if it's required by the spec, but looking at released processors I think this is true in practice.
Should I specify those too?

https://github.com/llvm/llvm-project/pull/143232